What Causes an Automatic Transmission Car to Fail to Shift Gears?

[Easton]

Automatic transmission cars may fail to shift gears due to reasons such as the gear lock being engaged, the P-lock mechanism being stuck and unable to reset, a damaged shift solenoid valve, or a malfunction in the control computer. Gear lock engaged: If the gear lock is engaged or stuck, the gear lever will inevitably fail to shift. In this case, you can use the key to unlock the gear lock. If this doesn't work, check the brake. When pressing the brake, observe whether the brake light turns on. If the brake light does not illuminate, the brake switch may be damaged. The car's computer cannot detect whether the brake is pressed, thus preventing gear shifting. The brake switch should be replaced promptly. P-lock mechanism stuck and unable to reset: The transmission P-lock mechanism consists of a lock gear, a lock pin, and a set of operating components. When shifting the gear lever to P, the cable drives the connecting ball pin, causing the working pin to slide and engage the lock pin pawl with the parking gear, thereby achieving parking lock. If the P-lock mechanism is stuck and cannot reset, it needs to be manually reset. Damaged shift solenoid valve: If the shift solenoid valve is damaged, it cannot execute shift commands. In this case, a repair shop should be consulted to replace the solenoid valve. Control computer malfunction: In this scenario, it is necessary to contact a 4S shop or repair center for professional maintenance.